JP5308222B2 - Steam generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly detect a state of heating without water in an evaporation container of a steam generator. <P>SOLUTION: This steam generator 10 includes the evaporation container 20 receiving a prescribed amount of water and having a steam supply port 20a formed at an upper section and a drain port 20b formed at a lower section, an electromagnetic induction heating coil 30 wound on an outer periphery of the evaporation container 20, a heat generating section 41a received in the evaporation container 20 and generating heat by being excited by the electromagnetic induction heating coil 30, and a non-heat generating section 41b disposed at an upper side of the heat generating section 41a, and not generating heat as it is positioned higher than a winding position of the electromagnetic induction heating coil 30. This steam generator 10 further includes a temperature sensor 43 detecting the heating without water in the evaporation container 20 by detecting a temperature of the non-heat generating section 41 of a heating member 40, and the heating without water in the evaporation container 20 is detected when the detection temperature by the temperature sensor 43 reaches 110&deg;C or more. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a steam generator used in a steam convection oven or the like.

  Patent Document 1 discloses a steam production apparatus that produces steam used for cooking food. This steam production apparatus is equipped with a vertically upward tubular boiler section in which a heating element is housed, and heats the heating element by heating the heating element by a magnetic field change generated by an exciting coil wound around the outer periphery of the boiler section. And steam is generated. This steam production apparatus is provided with a rising pipe that is erected in communication with the lower part of the boiler section, and is based on an input from a level meter for detecting the liquid level disposed in the rising pipe. The first electromagnetic on-off valve provided in the water supply system is turned on and off so that the liquid level in the boiler unit is controlled to be a predetermined value to prevent emptying.

  Patent Document 2 discloses a steam generator that produces steam used for cooking food and the like. This steam generator includes a heated water tank that stores water to be evaporated, an electric heater submerged in the heated water tank, and an electric heater that is provided above the electric heater with a gap therebetween and that is supplied with heat from the electric heater. And a temperature detecting device for detecting the temperature of the. This steam generator is controlled so that the water level in the heated water tank becomes constant by the control device, but when the water level drops for some reason and the electric heater is exposed above the water surface, it becomes an empty state. The control device stops the energization of the electric heater by detecting the temperature of the radiant heat of the electric heater (for example, 120 ° C.) higher than the temperature of the boiling water by the temperature detection device.

Japanese Patent Laid-Open No. 11-094203 JP-A-10-220706

  The steam production apparatus described in Patent Document 1 uses a liquid level meter to control the liquid level in the boiler unit to be a predetermined value and prevent it from becoming empty. However, if water cannot be supplied so that the liquid level in the boiler unit reaches a predetermined value, the boiler unit may become empty and the steam production apparatus may be damaged. Therefore, in the steam production apparatus described in Patent Document 1, a temperature detection device is provided on the upper side of the heating element as described in Patent Document 2, and water cannot be supplied so that the liquid level in the boiler section becomes a predetermined value. Sometimes, the temperature detecting device detects the temperature of the radiant heat of the heating element, so that the supply of high-frequency power to the exciting coil can be stopped to prevent emptying. However, as described in Patent Document 2, if the temperature detection device detects the temperature of the radiant heat of the heating element to prevent the boiler unit from becoming empty, the temperature detection device detects the radiant heat of the heating element. It takes time to detect the temperature of the air and it is not possible to prevent the airing quickly. The present invention aims to solve such problems.

  In order to solve the above-mentioned problems, the present invention stores a predetermined amount of water and has an evaporation container having a steam outlet at the top and a drain at the bottom, an electromagnetic induction heating coil wound around the outer periphery of the evaporation container, A steam generator that is housed in an evaporation vessel and heated by an electromagnetic induction heating coil to generate heat and heat the water in the evaporation vessel. A heat generating part that generates heat at the same height as the winding position, and a non-heat generating part that is above the heat generating part and is higher than the winding position of the electromagnetic induction heating coil so that it does not generate heat due to this electromagnetic induction heating coil The steam generator is provided with a temperature sensor for detecting the emptying in the evaporation container by detecting the temperature of the non-heating part of the heating body.

  The steam generator configured as described above is provided with a temperature sensor for detecting emptying in the evaporation container by detecting the temperature of the non-heating part of the heating body, and the temperature sensor is based on heat transfer from the heating part. By detecting the temperature of the heated non-heating part, it is possible to detect the emptying in the evaporation container. Therefore, detecting the temperature of heat released from the heating part of the heating element detects the emptying in the evaporation container. It will be possible to detect airing earlier than you can.

  In the steam generator configured as described above, an insertion hole for inserting the temperature sensor is formed in the non-heat generating portion of the heating body, and the temperature sensor is surely secured by inserting and fixing the temperature sensor into the insertion hole. In addition, the temperature of the non-heating part of the heating body can be detected.

  In the steam generator configured as described above, the temperature sensor can reliably detect the temperature of the non-heat generating portion of the heating body by fixing the temperature sensor in contact with the non-heating portion of the heating body.

  In the steam generator configured as described above, the temperature detected by the temperature sensor has continued for a predetermined period of time to be equal to or higher than a second predetermined temperature that is higher than the first predetermined temperature detected when no scale is attached to the heating element. If it is sometimes detected that the scale has adhered to the heating body, it is possible to detect that the scale has adhered to the heating body without providing a detection member such as a new sensor. Thereby, it can suppress that heating efficiency falls because a scale adheres to a heating body.

It is side sectional drawing of the steam generator which concerns on this invention. It is a perspective view of a heating body. It is a block diagram of a control apparatus. It is a sectional side view of other embodiment of the steam generator which concerns on this invention.

  Hereinafter, an embodiment of a steam generator according to the present invention will be described with reference to the drawings. A steam generator 10 according to the present invention is used in a cooking device such as a steam convection oven. As shown in FIG. 1, the steam generator 10 stores a predetermined amount of water and has a steam outlet 20a at the top and a drain at the bottom. Evaporating vessel 20 provided with 20b, electromagnetic induction heating coil 30 wound around the outer periphery of evaporation vessel 20, and housed in evaporation vessel 20 and excited by electromagnetic induction heating coil 30 to generate heat and evaporate. A heating body 40 that heats the water in the container 20, and the heating body 40 is located at the same height as the winding position of the electromagnetic induction heating coil 30, and generates heat at a heating portion 41 a and above the heating portion 41 a. Thus, the electromagnetic induction heating coil 30 is positioned higher than the winding position of the electromagnetic induction heating coil 30, so that the electromagnetic induction heating coil 30 includes a non-heat generating portion 41 b that does not generate heat. Therefore, the steam generator 10 includes a temperature sensor 43 for detecting the emptying in the evaporation container 20 by detecting the temperature of the non-heating part 41b of the heating body 40. Below, this steam generator 10 is explained in full detail.

  As shown in FIG. 1, the steam generator 10 includes a drain tank 11 installed in a machine room (not shown) of a heating cooker, an evaporation container 20 standing on the drain tank 11, and an outer periphery of the evaporation container 20. An electromagnetic induction heating coil 30 wound around, a heating body 40 accommodated in the evaporation container 20, and a steam delivery tube 50 for sending steam from the evaporation container 20 into a cooking chamber (not shown) of the heating cooker. A water level detection tank 60 for detecting the water level in the evaporation container 20, a float switch 61, and a control device 70 for controlling the operation of the steam generator 10 are provided.

  As shown in FIG. 1, the evaporation container 20 is made of a substantially cylindrical resin member having a steam outlet 20 a at the upper end and a drain outlet 20 b at the lower end, and is disposed on the drain tank 11 through a cylindrical connecting cylinder 21. Standing up. The evaporation container 20 has a shape in which no step portion is formed so that water is accumulated from the upper end steam outlet 20a to the lower end drain port 20b when drained from the drain port 20b. The connection tube 21 is provided with a drain ball valve 22 for draining the water stored in the evaporation container 20. When the drain ball valve 22 is opened, the water in the evaporation container 20 is drained at the lower end. It is discharged to the drain tank 11 through 20b. A through hole 20c for attaching a temperature sensor 43 described later is formed in the upper outer periphery of the evaporation container 20. On the outer periphery of the evaporation container 20, two annular mounting brackets 23 and 24 are attached to an intermediate portion in the axial direction so as to be separated from each other in the vertical direction. On the outer periphery of the evaporation container 20, an electromagnetic induction heating coil 30 is wound between the upper and lower mounting brackets 23 and 24. Further, the upper and lower mounting brackets 23 and 24 are provided with a plurality of rod-like ferrites 25 on the outer peripheral side of the electromagnetic induction heating coil 30 so as not to leak electromagnetic waves generated by the electromagnetic induction heating coil 30 to the outside. .

  As shown in FIGS. 1 and 2, the heating body 40 includes seven heating rods 41 suspended in the evaporation vessel 20 and a support holder (support) that supports these heating rods 41 integrally on the upper portion of the evaporation vessel 20. Part) 42. The seven heating rods 41 are made of a cylindrical conductive metal member, are located at the same height as the winding position of the electromagnetic induction heating coil 30, and generate heat by the electromagnetic induction heating coil 30. The heat generating portion 41a includes non-heat generating portions 41b and 41c that are located above and below the heat generating portion 41a and do not generate heat due to being higher or lower than the winding position of the electromagnetic induction heating coil 30. The heating rod 41 is made of a metal member having high thermal conductivity, and the heat generating portion 41a and the non-heat generating portions 41b and 41c are continuous with the same member. Therefore, when the heat generating part 41a of the heating rod 41 is not in water in the evaporation container 20, the heat generated in the heat generating part 41a is quickly transmitted to the non-heat generating parts 41b and 41c.

  The heating body 40 is suspended in the evaporation container 20 by supporting the non-heat generating part 41b at the upper part thereof to the outlet 20a at the upper end of the evaporation container 20 by the support holder 42 without bringing the lower end into contact with the lower part of the evaporation container 20. It is installed. In the heating body 40, the non-heat generating portion 41b of the heating rod 41 is supported on the upper portion of the evaporation container 20 by the support holder 42, so that the support holder 42 and the evaporation container 20 are not deformed at a temperature of steam. Can be used.

  Of the seven heating rods 41, one heating rod 41 has an insertion hole 41d formed in the upper non-heat generating portion 41b in a direction perpendicular to the axial direction. The heating rod 41 has an insertion hole 41d in the evaporation container. 20 is accommodated in the evaporation container 20 so as to be coaxial with the through hole 20c in the upper peripheral portion. A temperature sensing portion 43c of a temperature sensor 43 that detects the temperature of the non-heating portion 41b of the heating rod 41 is inserted into the insertion hole 41d of the heating rod 41 so as to contact the non-heating portion 41b. The temperature sensor 43 is for detecting the emptying in the evaporation container 20 by detecting the temperature of the non-heat generating part 41b of the heating rod 41. From the base part 43a and the rod-like detection part 43b extending from the base part 43a, the temperature sensor 43 is provided. Become. The temperature sensor 43 inserts the detection unit 43b into the through hole 20c of the evaporation container 20 and the insertion hole 41d of the heating rod 41 in a state where the base 43a is on the outer peripheral side of the evaporation container 20, and the temperature sensor 43 is connected to the detection unit 43b. The temperature sensing portion 43c at the tip is inserted into the insertion hole 41d of the heating rod 41 without a gap. When the heat generating part 41a of the heating rod 41 is in water in the evaporation container 20 and generates heat, the heat of the heat generating part 41a is exchanged with the water in the evaporation container 20 and is only slightly transferred to the non-heat generating parts 41b and 41c. At this time, since the steam generated in the evaporation container 20 passes through the non-heat generating portion 41b, the temperature is substantially the same as the temperature of the steam and is 100 ° C. On the other hand, when the heat generating portion 41a of the heating rod 41 generates heat without being in water in the evaporation container 20, the heat of the heat generating portion 41a is not heat exchanged with the water in the evaporation container 20, and thus is radiated in the evaporation container 20. At the same time, it is quickly transmitted to the non-heat generating portions 41b and 41c. At this time, the non-heating part 41b becomes 110 ° C. or higher, which is higher than the steam temperature, due to heat transfer from the heating part 41a.

  As shown in FIGS. 1 and 2, the support holder 42 is formed of a substantially bottomed cylindrical resin member, and the outer peripheral surface of the support holder 42 is fitted with the inner peripheral surface of the upper end portion of the evaporation container 20. A flange portion 42 a formed at the upper edge of 42 is engaged with the upper end of the evaporation container 20. Seven cylindrical holding parts 42b for holding the seven heating rods 41 are formed on the lower surface of the bottom wall of the support holder 42. The holding part 42b has a non-heating part 41b on the upper side of the heating bar 41. The upper end is fitted and fixed. The support holder 42 is provided with a handle portion 42c for attaching and detaching the heating body 40 that passes the positions of the inner peripheral surfaces facing each other. By holding the handle portion 42c, the heating body 40 is pulled upward. The operation of removing the heating body 40 from the evaporation container 20 is facilitated. The support holder 42 has a central portion of the bottom wall 42d and a plurality of vapor passage openings 42e formed from the peripheral edge to the peripheral surface of the bottom wall 42d, and most of the water droplets splashing in the evaporation container 20 Is suppressed from being delivered from the vapor outlet 20a of the evaporation container 20 by the bottom wall (shielding part) 42d of the support holder 42, and the steam generated in the evaporation container 20 passes through the passage openings 42e of the support holder 42. It passes through and is sent out from the vapor outlet 20a of the evaporation container 20.

  As shown in FIG. 1, the steam delivery tube 50 is for delivering steam generated in the evaporation container 20 to a cooking chamber (not shown), and the steam outlet 20 a at the upper end of the evaporation container 20 and cooking. A steam inlet provided in a warehouse (not shown) is connected. The steam delivery tube 50 is a water droplet separation tube portion 51 that is erected from the vapor delivery port 20a in the evaporation container 20 and is closed on the upper side, and is branched from an intermediate portion of the water droplet separation tube portion 51 to provide a steam outlet. It consists of the steam extraction cylinder part 52 connected to the steam inlet of a cooking chamber (not shown). The water droplet separation cylinder 51 collides with the top of the steam that rises vigorously including the water droplets from the vapor delivery port 20a in the evaporation container 20 to reduce the momentum, and drops the water droplets from the vapor with reduced momentum. It is for separating into steam that does not contain water droplets. The steam extraction cylinder part 52 sends out the steam from which water droplets have been separated by the water drop separation cylinder part 51 from its outlet to a cooking chamber (not shown).

  As shown in FIG. 1, the water level detection tank 60 is for detecting the water level in the evaporation container 20 by the float switch 61 provided in the inside. The water level detection tank 60 is erected in parallel with the side of the evaporation container 20, and the lower part of the water level detection tank 60 is connected to a position below the position where the electromagnetic induction heating coil 30 of the evaporation container 20 is wound. The pipes 62 are connected in communication. The water level detection tank 60 is open to the atmosphere like the evaporation container 20, and the water level detection tank 60 has the same water level as the evaporation container 20. The float switch 61 detects the water level of the evaporation container 20 by detecting the water level in the water level detection tank 60, detects the position that is the upper end of the heat generating portion 41a of the heating rod 41 as the upper limit water level L1, A water level slightly below the upper limit water level L1 is detected as the lower limit water level L2. A water supply pipe 63 derived from a water supply source such as water supply is connected to the lower part of the water level detection tank 60, and the water supply pipe 63 supplies water to the water level detection tank 60 by opening the water supply valve 64.

  The control device 70 includes a microcomputer and is connected to the drain ball valve 22, the electromagnetic induction heating coil 30, the temperature sensor 43, the float switch 61, and the water supply valve 64. The control device 70 controls the opening and closing of the water supply valve 64 based on the detected water level by the float switch 61 so as to control the inside of the evaporation container 20 to the upper limit water level L1 as a predetermined water level. More specifically, when the water in the evaporation container 20 decreases due to the generation of steam and the float switch 61 inputs a detection water level lower than the lower limit water level L2, the control device 70 opens the water supply valve 64 and opens the water supply pipe. When water is supplied into the evaporation container 20 by 63 and water is supplied into the evaporation container 20 and a detection water level higher than the upper limit water level L1 is input by the float switch 61, the water supply valve 64 is closed and the evaporation container 20 is closed. It is controlled to stop the water supply to the inside.

  The control device 70 controls the high frequency power to be supplied to the electromagnetic induction heating coil 30 so as to obtain a predetermined steam amount based on a cooking program of a heating cooker (not shown). When the control device 70 is executing the above cooking program and the float switch 61 inputs a detected water level lower than the lower limit water level L2, the detected water level lower than the lower limit water level L2 even if the water supply valve 64 is opened. When the input is continued for a predetermined time, it is detected that water is not supplied into the evaporation container 20, and control means for stopping the supply of high-frequency power to the electromagnetic induction heating coil 30 so that the evaporation container 20 does not become empty. It has.

  In addition, when the float switch 61 is broken or the like and the detection water level below the lower limit water level L2 is not input, the control device 70 inputs the detection temperature of 110 ° C. or more as the detection temperature by the temperature sensor 43 as a predetermined temperature. And detecting means for detecting that the water in the evaporation container 20 is below the lower limit water level L2 and the evaporation container 20 is empty. The control device 70 includes control means for stopping the supply of high-frequency power to the electromagnetic induction heating coil 30 when the detection means detects that the inside of the evaporation container 20 is empty.

  In this steam generator, when the scale is hardly attached to the heating rod 41, the heat generated in the heat generating portion 41a of the heating rod 41 is exchanged with the water in the evaporation container 20, so that the non-heat generating portion 41b is slightly changed. Can only be transmitted. Therefore, the temperature of the non-heat generating portion 41b is 100 ° C. as substantially the same temperature as the temperature of the steam generated in the evaporation container 20. On the other hand, when a large amount of scale is attached to the heating rod 41, the heat generated in the heat generating portion 41a of the heating rod 41 is insulated by the scale, so that it is difficult to exchange heat with water in the evaporation container 20, and non-heat generation. A lot is transmitted to the part 41b. Therefore, the temperature of the non-heat generating portion 41 b is higher than the temperature of the steam generated in the evaporation container 20. The inside of the evaporation container 20 is controlled to reach the upper limit water level L1 as a predetermined water level, and the heat generating portion 41a of the heating rod 41 is excited by the electromagnetic induction heating coil 30 to generate heat and generate steam in the evaporation container 20. Sometimes, the control device 70 detects a temperature equal to or higher than a second predetermined temperature (for example, 105 ° C.) higher than a first predetermined temperature (for example, 100 ° C.) detected when the scale hardly adheres to the heating rod 41 by the temperature sensor 43. When the input of temperature is continued for a predetermined time (for example, 5 minutes), a detection means for detecting that a large amount of scale is attached to the heating rod 41 is provided. When detecting that the scale has adhered to the heating rod 41 by this detection means, the control device 70 notifies that the scale has adhered to the heating rod 41 by notifying means such as turning on a lamp (not shown).

  Further, in the steam generator 10, the control device 70, when the water in the evaporation container 20 is reduced due to the generation of steam as described above, and there is an input of a detected water level lower than the lower limit water level L2 by the float switch 61. When the water supply valve 64 is opened to supply water from the water supply pipe 63 into the evaporation container 20 and a detection water level higher than the upper limit water level L1 is input by the float switch 61, the water supply valve 64 is closed and the evaporation container 20 is closed. It is controlled to stop water supply inside. In the steam generator 10, high-frequency power of a predetermined value (for example, when the output is maximized) is supplied to the electromagnetic induction heating coil 30 to generate heat in the heat generating portion 41 a of the heating rod 41, thereby water in the evaporation container 20 is discharged. Since the amount of steam delivered from the evaporation container 20 is constant during heating, the interval at which the water supply valve 64 is opened is also substantially constant every predetermined time (for example, every 60 seconds). However, when the scale adheres to the heating rod 41, the heating rod 41 is insulated by the scale as described above, and the efficiency of heat exchange with the water in the evaporation vessel 20 is deteriorated. The heating efficiency is reduced. In such a case, when the high-frequency power of the predetermined value is supplied to the electromagnetic induction heating coil 30 to generate heat in the heat generating portion 41a of the heating rod 41 to heat the water in the evaporation container 20, the water supply valve 64 is turned on. The opening interval becomes longer than every predetermined time (for example, every 60 seconds). The controller 70 supplies the electromagnetic induction heating coil 30 with a high-frequency power of a predetermined value to cause the heat generating portion 41a of the heating rod 41 to generate heat, and the water in the evaporation container 20 decreases due to the generation of steam, and the lower limit is set by the float switch 61. If there is an input of a detected water level lower than the water level L2, the water supply valve 64 is opened to supply water into the evaporation vessel 20 from the water supply pipe 63, and if a detected water level higher than the upper limit water level L1 is input by the float switch 61 When the water supply valve 64 is closed to control the supply of water into the evaporation container 20, the time interval for opening the water supply valve 64 measured by the built-in timer 71 is set in the heating rod 41. If there is an input indicating that the time interval (for example, 120 seconds) is longer than the time interval (for example, 60 seconds) when the scale is not attached, the heating rod 41 is scaled. And a detection means for detecting a has a large amount of deposition. In the same way as described above, when the controller 70 detects that the scale is attached to the heating rod 41 by this detecting means, it means that the scale is attached to the heating rod 41 by notifying means such as turning on a lamp (not shown). Is notified.

  The operation of the steam generator 10 configured as described above will be described. In the steam generator 10, the control device 70 supplies high-frequency power of a predetermined value to the electromagnetic induction heating coil 30 to generate heat at the heat generating portion 41a of the heating rod 41, and the water in the evaporation container 20 is generated by the generation of steam. If the detected water level is lower than the lower limit water level L2 by the float switch 61, the water supply valve 64 is opened to supply water into the evaporation container 20 from the water supply pipe 63, and the float switch 61 causes the water from the upper limit water level L1. When there is an input of a high detection water level, the water supply valve 64 is closed to control the supply of water into the evaporation container 20. The steam generated by the heat generation of the heat generating part 41a in the evaporation container 20 is sent from the steam outlet 20a of the evaporation container 20 through the plurality of steam passage ports 42e of the support holder 42 of the heating body 40, and is sent out as steam. It is sent out into the cooking chamber of a heating cooker (not shown) by the cylinder 50.

  The steam generator 10 configured as described above includes a temperature sensor 43 for detecting emptying in the evaporation container 20 by detecting the temperature of the non-heat generating portion 41b above the heating rod 41, and the temperature sensor 43 Can detect emptying by detecting the temperature of the non-heat generating part 41b heated by the heat transfer from the heat generating part 41a that has become high temperature, so the temperature of heat radiation from the heat generating part 41a of the heating rod 41 can be determined. By detecting, it becomes possible to detect emptying earlier than detecting emptying in the evaporation container 20. Further, since the temperature sensor 43 detects the temperature of the non-heat generating portion 41b at the same height as the non-heat generating portion 41b, the temperature sensor 43 does not generate heat by the electromagnetic induction heating coil 30 or by the electromagnetic induction heating coil 30. The detection is not unstable due to the influence of electromagnetic waves.

  In the steam generator 10 configured as described above, an insertion hole 41d for inserting the temperature sensor 43 is formed in the non-heat generating part 41b of the heating rod 41, and the temperature sensing part 43c of the temperature sensor 43 is inserted into the insertion hole 41d. If it is inserted into and fixed, the temperature sensor 43 can reliably detect the temperature of the non-heat generating portion 41b of the heating rod 41. In particular, since the temperature sensor 43 has the temperature sensing portion 43c inserted into the insertion hole 41d formed in the non-heating portion 41b of the heating rod 41, the temperature sensor 43 does not generate heat due to the scale adhering to the temperature sensing portion 43c. It does not become difficult to detect the temperature of the part 41b.

  In the steam generator 10 configured as described above, water is stored in the evaporation container 20 so as to reach the upper limit water level L1 as a predetermined water level, and the heat generating portion 41a of the heating rod 41 is excited by the electromagnetic induction heating coil 30. A second temperature detected by the temperature sensor 43 when the scale is not attached to the heating rod 41 (eg, 100 ° C.) detected when the heat is generated and vapor is generated from the evaporation container 20. When it is continuously detected that the temperature is equal to or higher than a predetermined temperature (for example, 105 ° C.) for a predetermined time (for example, 5 minutes), it is detected that the scale has adhered to the heating rod 41. It is possible to detect that the scale has adhered to the heating rod 41 without providing it. Thereby, it can suppress that heating efficiency falls because a scale adheres to the heating rod 41. FIG.

  In the steam generator 10 configured as described above, a predetermined value of high frequency power is supplied to the electromagnetic induction heating coil 30 to cause the heat generating portion 41a of the heating rod 41 to generate heat, and the water in the evaporation container 20 is generated by the generation of steam. If the detected water level is lower than the lower limit water level L2 by the float switch 61, the water supply valve 64 is opened to supply water into the evaporation container 20 from the water supply pipe 63, and the float switch 61 causes the water from the upper limit water level L1. When control is performed to close the water supply valve 64 and stop the supply of water into the evaporation container 20 when a high detection water level is input, the water supply valve 64 measured by the built-in timer 71 is opened. The time interval to be performed is longer than the time interval when the scale is not attached to the heating rod 41 (for example, 60 seconds) (for example, 120 seconds). When there is an input, since a detecting means for detecting that a large amount of scale is attached to the heating rod 41 of the heating body 40 is provided, the scale adheres to the heating rod 41 without providing a detection member such as a new sensor. Can be detected. Thereby, it can suppress that heating efficiency falls because a scale adheres to the heating rod 41. FIG.

  In the steam generator 10 configured as described above, as shown in FIG. 4, the temperature sensor 43 may cause the temperature sensing part 43 c to abut on the non-heating part 41 b of the heating rod 41, as described above. In this case, the temperature sensor 43 can reliably detect the temperature of the non-heat generating portion 41b of the heating rod 41. In particular, since the temperature sensor 43 has the temperature sensing portion 43c in contact with the non-heat generating portion 41b of the heating rod 41, the temperature sensor 43 has a scale attached to the portion of the temperature sensing portion 43c that contacts the non-heating portion 41b. Thus, it is not difficult to detect the temperature of the non-heat generating portion 41b. Further, if the temperature sensor 43 is fixed to the non-heat-generating portion 41b by binding the temperature-sensitive portion 43c with a heat-resistant resin band, the temperature sensor 43 reliably heats the temperature-sensitive portion 43c without detaching from the non-heat-generating portion 41b. The temperature of the non-heating part 41b of the rod 41 can be detected.

  Moreover, in said embodiment, although the heating rod 41 becomes what the heat generating part 41b and the non-heat generating parts 41b and 41c consist of the same member with high heat conductivity continuously, this invention is limited to this. In addition, even if the heating rod 41 is a metal member in which the heat generating portion 41b and the non-heat generating portions 41b and 41c are different from each other, the non-heat generating portions 41b and 41c are connected to the heat generating portion 41b with high thermal conductivity, The heat generated by the heat generating portion 41a may be quickly transmitted to the non-heat generating portions 41b and 41c, and the same effects as those described above can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Steam generator, 20 ... Evaporation container, 20a ... Outlet, 20b ... Drain outlet, 30 ... Electromagnetic induction heating coil, 40 ... Heating body, 41a ... Heat generating part, 41b ... Non-heat generating part, 41d ... Insertion hole, 43 ... temperature sensor.

Claims (4)

An evaporation vessel that stores a predetermined amount of water and has a steam outlet at the top and a drain at the bottom;
An electromagnetic induction heating coil wound around the outer periphery of the evaporation container;
A steam generator comprising a heating body that is contained in the evaporation container and generates heat by being excited by the electromagnetic induction heating coil to heat water in the evaporation container;
The heating body is located at the same height as the winding position of the electromagnetic induction heating coil and has a heat generating portion that generates heat, and is located above the heat generating portion and higher than the winding position of the electromagnetic induction heating coil. This electromagnetic induction heating coil consists of a non-heat generating part that does not generate heat,
A steam generator comprising a temperature sensor for detecting emptying in the evaporation container by detecting a temperature of a non-heating part of the heating body. The steam generator according to claim 1,
An insertion hole for inserting the temperature sensor is formed in the non-heating part of the heating body,
A steam generator, wherein the temperature sensor is inserted into the insertion hole and fixed. The steam generator according to claim 1,
A steam generator characterized in that the temperature sensor is fixed in contact with a non-heating part of the heating element. In the steam generator according to any one of claims 1 to 3,
When a predetermined amount of water is stored in the evaporation container and the heat generating part of the heating body is excited by the electromagnetic induction heating coil to generate heat and generate steam from the evaporation container,
When the temperature detected by the temperature sensor is equal to or higher than a second predetermined temperature higher than a first predetermined temperature detected when no scale is attached to the heating body, the scale adheres to the heating body A steam generator characterized by detecting this.

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